CVE-2026-91146

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-15. the CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Takahe through 0.11.0 fails to restrict URL schemes in link hrefs within federated post content and profile summaries, allowing remote actors to inject javascript: links. Attackers can deliver federated content with malicious javascript: hrefs that execute in the instance origin when clicked, enabling session hijacking or impersonation of viewers.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Takahe through 0.11.0 Cross-Site Scripting via javascript: URL Scheme | Advisories | VulnCheck

https://www.vulncheck.com/advisories/takahe-through-0.11.0-cross-site-scripting-via-javascript-url-scheme
generic

takahe/core/html.py at 0.11.0 · jointakahe/takahe · GitHub

https://github.com/jointakahe/takahe/blob/0.11.0/core/html.py
generic

GitHub - jointakahe/takahe: An ActivityPub/Fediverse server · GitHub

https://github.com/jointakahe/takahe
generic

Stored XSS via javascript: URI in post content and profile summary HTML sanitizer · Issue #728 · jointakahe/takahe · GitHub

https://github.com/jointakahe/takahe/issues/728

Vendor Advisories for CVE-2026-91146(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 14:53 UTCEG score recompute
  2. 2026-09-24 14:53 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 17:21 UTCGHSA enrichment
  6. 2026-09-22 19:00 UTCEG score recompute
  7. 2026-09-22 19:00 UTCGHSA enrichment
  8. 2026-09-22 16:01 UTCEPSS rescore
  9. 2026-09-21 21:09 UTCEPSS rescore
  10. 2026-09-21 18:53 UTCEG score recompute
  11. 2026-09-21 18:53 UTCGHSA enrichment
  12. 2026-09-20 20:16 UTCEPSS rescore
  13. 2026-09-20 18:46 UTCGHSA enrichment
  14. 2026-09-19 18:40 UTCEG score recompute
  15. 2026-09-19 18:40 UTCGHSA enrichment
  16. 2026-09-18 19:28 UTCEPSS rescore
  17. 2026-09-18 18:33 UTCEG score recompute
  18. 2026-09-18 18:33 UTCGHSA enrichment
  19. 2026-09-18 17:29 UTCEG score recompute
  20. 2026-09-18 17:29 UTCGHSA enrichment
  21. 2026-09-17 23:50 UTCEG score recompute
  22. 2026-09-17 23:50 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-16 22:34 UTCEG score recompute
  25. 2026-09-16 22:34 UTCGHSA enrichment
Show 7 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 22:27 UTCEG score recompute
  4. 2026-09-15 22:27 UTCGHSA enrichment
  5. 2026-09-14 22:19 UTCEG score recompute
  6. 2026-09-14 21:54 UTCEG score recompute
  7. 2026-09-14 21:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91146?
CVE-2026-91146 is a medium vulnerability published on September 14, 2026. Takahe through 0.11.0 fails to restrict URL schemes in link hrefs within federated post content and profile summaries, allowing remote actors to inject javascript: links. Attackers can deliver federated content with malicious javascript: hrefs that execute in the instance origin when clicked,…
When was CVE-2026-91146 disclosed?
CVE-2026-91146 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91146 actively exploited?
CVE-2026-91146 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.6% of all scored CVEs.
What is the CVSS score of CVE-2026-91146?
CVE-2026-91146 has a CVSS v4.0 base score of 6.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-91146?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91146, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-91146

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